If you fly RC planes via FPV then you'll know how important good video antennas are to success.
Simon from the UK sent me one of the 5-turn helical antennas he sells for 20 quid and, based on some secret flight-testing, it seems to work very well indeed.
I wish he'd protect the copper backplane and wire from oxidation -- but apart from that these helicals seem hard to fault.
Watch for an upcoming video where I compare a range of helicals from US$10 through to US$90 and see which offers best value and performance.
After some sleuthing, I think this is a link to where Simon (bignose13) sells his antennas:
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